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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 853 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.44 + 18 =
  2. 2.373 + 17 =
  3. 3.234 + 67 =
  4. 4.115 + 88 =
  5. 5.89 + 38 =
  6. 6.177 + 17 =
  7. 7.212 + 28 =
  8. 8.86 + 48 =
  9. 9.46 + 78 =
  10. 10.433 + 77 =
  11. 11.331 + 79 =
  12. 12.244 + 47 =
  13. 13.443 + 37 =
  14. 14.36 + 47 =
  15. 15.373 + 68 =
  16. 16.68 + 28 =
  17. 17.111 + 28 =
  18. 18.207 + 28 =
  19. 19.282 + 27 =
  20. 20.442 + 97 =
  21. 21.39 + 89 =
  22. 22.38 + 39 =
  23. 23.84 + 67 =
  24. 24.475 + 27 =
  25. 25.181 + 57 =
  26. 26.74 + 47 =
  27. 27.38 + 99 =
  28. 28.137 + 29 =
  29. 29.440 + 49 =
  30. 30.197 + 27 =
  31. 31.257 + 97 =
  32. 32.134 + 59 =
  33. 33.424 + 69 =
  34. 34.453 + 39 =
  35. 35.481 + 19 =
  36. 36.416 + 27 =
  37. 37.228 + 19 =
  38. 38.289 + 39 =
  39. 39.463 + 88 =
  40. 40.261 + 39 =

Answer key

  1. 62
  2. 390
  3. 301
  4. 203
  5. 127
  6. 194
  7. 240
  8. 134
  9. 124
  10. 510
  11. 410
  12. 291
  13. 480
  14. 83
  15. 441
  16. 96
  17. 139
  18. 235
  19. 309
  20. 539
  21. 128
  22. 77
  23. 151
  24. 502
  25. 238
  26. 121
  27. 137
  28. 166
  29. 489
  30. 224
  31. 354
  32. 193
  33. 493
  34. 492
  35. 500
  36. 443
  37. 247
  38. 328
  39. 551
  40. 300

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